Chuck for holding abrasive elements in web form



B. B. LUKENS Dec. 6, 1955 CHUCK FOR HOLDING ABRASIVE ELEMENTS IN WEB FORM Filed Nov. 30, 1953 //\/z/&/\/7-UF BERT b LUKENS IIII-IIIIIII IIII I IIII I n All! I! I I! I ATT /v5s CHUCK FOR HOLDING ABRASIVE ELEMENTS IN WEB FORM Bert B. Lukens, Portland, Oreg. 7

Application November 30, 1953, Serial No. 395,094

2 Claims. (Cl. 51-1935) This invention relates generally to sanding and polishing devices and particularly to a chuck for holding abrasive elements in web form.

The main object of this invention is to provide a simple and effective holder for strips of abrasive paper or cloth for use in rotary power driven sanders and similar machines.

I accomplish these and other objects in the manner set forth in the following specification as illustrated in the accompanying drawing, in which Fig. 1 is a perspective view of the device.

Fig. 2 is an end elevation showing the relation of the abrasive strips to the device.

Fig. 3 is a section taken along the line 3-3 in Fig. 1.

Fig. 4 is a broken section taken along the line 4-4 in Fig. 2.

Fig. 5 is a perspective view of the core with a portion broken away in section.

Fig. 6 is a perspective view of a piece of paper or cloth covered with abrasive.

Like numbers of reference refer to the same or similar parts throughout the several views.

Referring in detail to the drawing there is shown a cylindrical core 10 having a flattened hub 11 from which projects a stub shaft or shank 12 having a fiat spot 13 on the end thereof. This shank will fit the chuck of an electric drill, router, or other rotary driven chuck.

The core 10 has an undercut flange 14 adjacent to the hub 11. The core 10 has a central bore 15 which is threaded to receive the cap screw 16. The core 10 is provided with a plurality of slots 17 which are inclined away from the radii of the core 10 but parallel to the axis thereof and extend along the length of the core 10 from the end 18 to the hub 11.

Around the core 10 is placed a sleeve 19 whose end 20 is bevelled to match the undercut flange 14 and its nited States Patent 0 2,725,694 Patented Dec. 6, 1955 "ice end 21 is closed and provided with a hexagonal boss 22 through which extends the screw 16. The sleeve 19 is provided with slots 23 which register with the slots 17 in the core 10.

It will be noted in Fig. 3 that the slots 23 are not in complete register with the slots 17 and that the flexible abrasive strips 24 are held in a binding action between the slots 17 and 23 leaving the free end 25 of each strip 24 free to engage the work.

By simply rotating the parts 10 and 19 with relation to each other before tightening the screw 16, any desired degree of clamping action may be obtained. Use is also made of the centrifugal action which tends to throw the strips 24 outwardly against the work instead of pressing the strip against the work by means of a solid or yielding arbor.

I claim:

1. A chuck for holding flexible abrasive strips comprising a cylindrical core having a shank on one end for connection with a driving element, an undercut beveled flange on said one end of said core, a cylindrical sleeve closely fitting over said core and having a beveled end engaging said beveled flange, said sleeve and core having a plurality of registering longitudinal slots therein to receive a plurality of said abrasive strips, said slots having approximately the same thickness as said strips, an end wall on the other end of said sleeve, and a screw passing through said end wall and having threaded engagement with said core to clamp said beveled end of said sleeve tightly against said beveled flange and to clamp said sleeve in a rotative position on said core with the slots in said core and sleeve slightly out of register to bind said strips between said slots.

2. A chuck as defined in claim 1 in which said slots are inclined from longitudinal radial planes through the chuck.

References Cited in the file of this patent UNITED STATES PATENTS 540,258 Keagle June 4, 1895 603,357 Bagley May 3, 1898 822,503 Boynton June 5, 1906 1,374,052 Branner et al Apr. 5, 1921 1,685,406 Kimman Sept. 25, 1928 2,259,475 Koether Oct. 21, 1941 2,422,759 Thrun June 24, 1947 FOREIGN PATENTS 20,421 Great Britain Oct. 25, 1894 

